CHEMISTRY IN CONTEXT
ACID/BASE WORKSHEET, PAGE 1
NOVEMBER 14, 2006
NAME
Properties of Acids and Bases
DIRECTIONS:
PART A -- WEB RESEARCH
Access the following web site and answer the questions in a FEW
COMPLETE SENTENCES.
http://dbhs.wvusd.k12.ca.us/webdocs/AcidBase/Acid-Base-Properties.html
1)
List 3 properties specific to acids. (LOW pH)
a.
b.
c.
2)
List 3 properties specific to bases. (HIGH pH)
a.
b.
c.
3)
List 2 properties (different from the ones listed above) that acids and bases
SHARE.
a.
b.
CHEMISTRY IN CONTEXT
ACID/BASE WORKSHEET, PAGE 2
NOVEMBER 14, 2006
DIRECTIONS:
NAME
PART B -- WEB APPLICATIONS
On a the scale of 1-14, the relative pH of an acid is 0-6. The
relative pH of a base is 8-14. Access the following web sites and
identify the RELATIVE pH range for each picture. Use the table
below to help.
Acid
Household
Source
Base
Household
Source
citric acid
oranges,
grapefruits
sodium hydroxide
(caustic soda)
oven cleaner
tartaric acid
grapes
magnesium
hydroxide
milk of magnesia
ascorbic acid
Vitamin C
sodium hypochlorite
bleach
acetic acid
vinegar
methanoic acid
stingers of some
ants
butanoic acid
rancid butter
oxalic acid
tomatoes
stearic acid
animal fat
1)
http://tlsweb.150m.com/8thgrade/Classwork/AcidBasePics/Item1.jpg
SUBSTANCE
RELATIVE PH RANGE
2)
http://tlsweb.150m.com/8thgrade/Classwork/AcidBasePics/Item2.jpg
SUBSTANCE
RELATIVE PH RANGE
3)
http://tlsweb.150m.com/8thgrade/Classwork/AcidBasePics/Item3.jpg
SUBSTANCE
RELATIVE PH RANGE
4)
http://tlsweb.150m.com/8thgrade/Classwork/AcidBasePics/Item4.jpg
SUBSTANCE
RELATIVE PH RANGE
5)
http://tlsweb.150m.com/8thgrade/Classwork/AcidBasePics/Item5.jpg
SUBSTANCE
RELATIVE PH RANGE
6)
http://tlsweb.150m.com/8thgrade/Classwork/AcidBasePics/Item6.jpg
SUBSTANCE
RELATIVE PH RANGE
CHEMISTRY IN CONTEXT
ACID/BASE WORKSHEET, PAGE 3
NOVEMBER 14, 2006
DIRECTIONS:
NAME
PART C -- INTERACTIVE LAB
A titration is an experiment where an acid and base are mixed and
their pH is studied as they react with one another.
1)
Access the web site below and SCROLL DOWN to the
Acid-Base Titration Lab box.
2)
Type your name and click NEXT.
3)
As you proceed, ONLY CHANGE SELECTIONS WHEN
DIRECTED by this handout.
4)
Answer the questions below with SHORT ANSWERS as you
get to each step and click NEXT to go to the next step.
http://lrs.ed.uiuc.edu/students/mihyewon/chemlab_experiment.html
Step 1
::
What acid are you using?
How much?
Step 2
::
What base are you using?
How much?
Step 3
::
Select a color indicator that you would like to use.
Step 4
::
Record the initial pH of the flask.
Record the initial color of your flask.
Move the speed bar to 1/2 way between slow and fast and WATCH and
WAIT for the titration to end.
At what pH does the color start changing?
Record the final pH of the flask.
Record the final color of the flask.
CHEMISTRY IN CONTEXT
ACID/BASE WORKSHEET, PAGE 4
NOVEMBER 14, 2006
Step 5
::
NAME
Sketch a picture of your titration curve below:
14
10
pH
7
4
0
0
10
20
30
40
50
STOP after Step 5 and answer the following questions:
1)
Why do you think we use indicators that change colors when working with acids
and bases?
2)
According to your graph, how much base did it take to neutralize your acid?
(i.e. make it a pH of 7) Look back Step 1 to see how much acid you started with.
Now, which of your substances was stronger?
DIRECTIONS:
PART D – PRACTICE QUIZ
Take the online quiz at the following link as PRACTICE. Record
your score AND ALSO write into your notes ANY ITEMS from the
quiz that you DID NOT KNOW.
http://www.chem4kids.com/extras/quiz_reactacidbase/index.html